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Re:Trans/Diff Refill--'85 4kq
GL5 is currently recommended by Audi, since its a "step above" GL4. GL5 is
also used by the military, hence the
"Mil-Spec" equivalent. You cant go wrong using the GL5.
Basically you will have more protection than you will need!
In my CGT I run 145W/90 GL5. Why?
The differential bearings suffer excessive wear with 90W.
Bearings go, ring and pinion soon to follow!
Use a 2 foot plastic tube to fill gearbox.
Mik